The present work addresses a market demand for high refractive index (n(D)) coatings. We prepared organic UV-curable oligomers with n(D) > 1.6. We found a novel way to prepare sulfur-containing UV-curable high nD oligomers of melamine and urethane acrylates. Refractive indices of the synthesized oligomers were between 1.552 and 1.615. Cure of the oligomers led to films with n(D) = 1.559 and 1.660. A wide variety of mechanical properties for UV-cured oligomers can be obtained with the facile synthesis methods used.